Quote Originally Posted by Newt_on_Swings View Post
I think 35mm is the cheapest out of all the ultra wides. I have a Sigma 14mm 3.5 AF lens in Nikon mount, its probably one of the most affordable. Looking at completed ebay listings, this lens ranges from $70-$350, with the majority of them ending around between $150-$200. That is pretty cheap to get into the super wide spectrum with a rectilinear lens.
For the 35/4.5 Apo Grandagon's price, see http://www.bhphotovideo.com/c/produc...agon_Lens.html

I usually shoot mine on 2x3 without a center filter, but on 6x12 (actual size 56 x 112), it needs one. For price, see http://www.bhphotovideo.com/c/produc...er_Filter.html

The lenses you're thinking of barely cover 24 x 36.